WebGL2RenderingContext: drawArraysInstanced() method

{{APIRef("WebGL")}} {{AvailableInWorkers}} 

The WebGL2RenderingContext.drawArraysInstanced() method of the WebGL 2 API renders primitives from array data like the {{domxref("WebGLRenderingContext.drawArrays()", "gl.drawArrays()")}}  method. In addition, it can execute multiple instances of the range of elements.

[!NOTE] When using {{domxref("WebGLRenderingContext", "WebGL 1", "", 1)}} , the {{domxref("ANGLE_instanced_arrays")}}  extension can provide this method, too.

Syntax

drawArraysInstanced(mode, first, count, instanceCount)

Parameters

• mode

  • : A {{domxref("WebGL_API/Types", "GLenum")}}  specifying the type primitive to render. Possible values are:
    • gl.POINTS: Draws a single dot.
    • gl.LINE_STRIP: Draws a straight line to the next vertex.
    • gl.LINE_LOOP: Draws a straight line to the next vertex, and connects the last vertex back to the first.
    • gl.LINES: Draws a line between a pair of vertices.
    • gl.TRIANGLE_STRIP
    • gl.TRIANGLE_FAN
    • gl.TRIANGLES: Draws a triangle for a group of three vertices.

• first

  • : A {{domxref("WebGL_API/Types", "GLint")}}  specifying the starting index in the array of vector points.

• count

  • : A {{domxref("WebGL_API/Types", "GLsizei")}}  specifying the number of indices to be rendered.

• instanceCount

  • : A {{domxref("WebGL_API/Types", "GLsizei")}}  specifying the number of instances of the range of elements to execute.

Return value

None ({{jsxref("undefined")}} ).

Examples

gl.drawArraysInstanced(gl.POINTS, 0, 8, 4);

Specifications

{{Specifications}} 

Browser compatibility

{{Compat}} 

See also

• {{domxref("ANGLE_instanced_arrays.drawArraysInstancedANGLE()")}} 
• {{domxref("WEBGL_multi_draw.multiDrawArraysInstancedWEBGL()")}}